/*
 * FileAsMsg plug-in for Miranda IM and QIP Infium.
 * Sending/receiving files via instant messaging without protocol support.
 * Homepage: http://code.google.com/p/fileasmsg/
 *
 * Copyright (c) 2008, Radist <radist.nt@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Name(s) of contributor(s) may not be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Radist ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Radist BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "TransferSession.h"
#include "plugin.h"

DWORD TransferSession::send_timeout = 1500;
DWORD TransferSession::max_error_cnt = 20;

#pragma warning(disable: 4355)

//////////////////////////////////////////////////////////////////////////
// sending ack timer

TransferTimeoutTimer::TransferTimeoutTimer( TransferSession *ts )
: Timer(ts->send_timeout, true), sess(ts)
{
}

TransferTimeoutTimer::~TransferTimeoutTimer()
{
}

void TransferTimeoutTimer::Tick(void)
{
	if (InterlockedExchange((LONG*)&sess->AwaitingAckProcess, (LONG)INVALID_HANDLE_VALUE)!=(LONG)INVALID_HANDLE_VALUE)
	{
		sess->ProcessSent(true);
	}
}

//////////////////////////////////////////////////////////////////////////
// TransferSession

TransferSession::TransferSession( void )
: tmr(this)
{
}

TransferSession::TransferSession( TransferSession& )
: tmr(this)
{
}

TransferSession::TransferSession( HANDLE h_Contact, wchar_t *filename, DWORD flags, int filesize /*= 0*/, int chunksize /*= 0*/ )
: hContact(h_Contact), AwaitingAckProcess(INVALID_HANDLE_VALUE), tmr(this), error_cnt(0),
File(((DWORD)(-1)==flags) ? NULL : TransferFile::CreateTransferFile(filename, flags, filesize, chunksize)),
Window(new TransferWnd(filename, this))
{
}

TransferSession::~TransferSession( void ) /*=0*/
{
}

void TransferSession::MsgSend( const char*msg, bool WaitAck /*= true*/, bool Utf8 /*= false*/ )
{
	HANDLE hAck = SendIMMsg(hContact, msg, Utf8);
	if (!WaitAck)
	{
		return;
	}
	InterlockedCompareExchange((LONG*)&AwaitingAckProcess, (LONG)hAck, (LONG)INVALID_HANDLE_VALUE);
	tmr.Start();
}

bool TransferSession::ProcessAck( HANDLE Process, bool Success )
{
	if (Success)
	{
		if (InterlockedCompareExchange((LONG*)&AwaitingAckProcess, (LONG)INVALID_HANDLE_VALUE, (LONG)Process)==(LONG)Process)
		{
			tmr.Stop();
			ProcessSent(false);
			return true;
		}
	} 
	else
	{
		if (AwaitingAckProcess==Process)
		{
			if (error_cnt++>max_error_cnt)
			{
				EndTransfer();
			}
			return true;
		}
	}
	return false;
}

